ok, i was anorexic once, now recovering and as u, i can't eat to much food cus i trew up. And then i have this really bad habit of smoking (jesus i cant quit), that the only thing that relax me, i'm always stressed because of my studyies, my parets are always yelling at me to study and study and study more, and i'm not a machine, i can't concentrate and that makes me more stressed!
U have to find something else to concentrate, so u won't be thinking of your problem, like a hobbie or more anime, i don't know, read or anything while u are in the hospital, and buy some vitamins, but please don't do the same as me and try medicines that your doctor don't recomend u cus some of them are addictive and don't smoke.